81400302368 has 96 divisors (see below), whose sum is σ = 200040140160. Its totient is φ = 31676405760.

The previous prime is 81400302349. The next prime is 81400302499. The reversal of 81400302368 is 86320300418.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082428 + ... + 2121156.

It is an arithmetic number, because the mean of its divisors is an integer number (2083751460).

Almost surely, 2^81400302368 is an apocalyptic number.

81400302368 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81400302368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100020070080).

81400302368 is an abundant number, since it is smaller than the sum of its proper divisors (118639837792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81400302368 is a wasteful number, since it uses less digits than its factorization.

81400302368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39610 (or 39602 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 81400302368 in words is "eighty-one billion, four hundred million, three hundred two thousand, three hundred sixty-eight".